ROLLED BALL SCREWS – THE ALTERNATIVE IN LINEAR TECHNOLOGY

STEINMEYER I ROLLED BALL SCREWS 2.5 Rotation speed values 20 4.1 Flange nuts on mounting sleeves 30 - 33 4.2 Nuts with connecting thread 5.1.2 Dynamic axial load capacity 38 - 39

SCREW SHAFTS Steinmeyer delivers the following product range of screw shafts on short no- tice. Those marked with * are available upon request. The maximum available length of screw shafts is specified here. Different shaft lengths are available at additional cost. The standard accuracy class for rolled screw shafts is T7. Tolerance classes T5, T9 and T10 are available upon request. For information on ground ball screws please visit: www.steinmeyer.com Maximum available total length in meters. Different shaft lengths available for extra charge. Standard accuracy class T7 (T5, T9, T10 upon reguest)....

Flange single nut, multiliner, wiper on both sides | >>> Pages 30 – 33 Order code Order code NUTS ON MOUNTING SLEEVES NUTS ON MOUNTING SLEEVES Flange single nut, end cap return, wiper on both sides, two thread-starts | >>> Pages 30 – 33 Flange single nut, external through-the-nut return , wiper on both sides, two thread-starts | >>> Pages 30 – 33 Flange single nut, multiliner, wiper on both sides, two thread-starts | >>> Pages 30 – 33 8446/20.50.7,5.6

2 | BALL SCREW TECHNOLOGY 2 | BALL SCREW TECHNOLOGY 2.2 | ACCURACY CLASSES Steinmeyer classifies rolled ball screws according to ISO 3408 part 3 – as transport ball screws in tolerance class T5 through T10. Thread rolling 2.2.1 | Lead error Limit ep for the average lead error e0a [µm] T10 280 Heat treatment: annealing ...

2 I BALL SCREW TECHNOLOGY 2.2.2 I Shape and position tolerances The following values define the shape and position tolerances of the functional surfaces of the ball screws. They are specifically applicable when no other specifications are provided. Measurement using Vee-block supports at the outside diameter of the shaft at points A and A' and D and D'. Bearing journal concentric run-out Y1 [urn] Measurement E 6.1 according to ISO 3408 for journal length > ^ L. The following applies for L6>L: tolerance value *L6/L Drive journal concentric run-out Y2 [urn] Measurement E 6.1 according to ISO 34-08...

2 | BALL SCREW TECHNOLOGY 2 | BALL SCREW TECHNOLOGY 2.3 | BEARING JOURNALS AND BEARING RECOMMENDATIONS Concentric run-out of shaft exterior diameter Y6 for short shafts [µm] The mounting should allow for rotation of the shaft and simultaneously pass very high load bearing capacity and shaft that is adequate for the axial and the axial force on the ball screw stiffness, such that only high-quality prestressing force of this bearing is of into the adjacent construction with bearings that are optimized for drive crucial importance. as little deformation as possible. screw mounting can adequately...

2 I BALL SCREW TECHNOLOGY The support bearing of a ball screw should be able to absorb the axial lateral forces from the belt drive. It can sometimes be difficult to find a suitable bearing for ball screws with large cycle criteria, and high load rating. At the same time, the bearing should have a sufficiently small inner ring bore hole and a supporting diameter no larger than the shaft nominal diameter. This discussion thus only represents an initial point of reference for selection of bearings. It is by no means meant to be universally applicable or complete. The following criteria apply •...

2 I BALL SCREW TECHNOLOGY 2.3.3 Bearing journals - standard machining Shaft ends are machined as specified in the drawing. Enter the letter »Z« into the order reference and include the corresponding drawing. You will also be able to choose between the following fixed and loose bearing configurations. Thread recess DIN76 short Fixed bearing journals: A I Machining options: K - hexagonal socket, G - internal thread, N - keyway groove hole incl. drive journal) Cut-in for retaining ring DIN471 Loose bearing journals: B | Machining options: K - hexagonal socket, G - internal thread hole incl.

2 | BALL SCREW TECHNOLOGY 2 | BALL SCREW TECHNOLOGY 2.4 | BALL RETURN As the world‘s only manufacturer never to use tubes, Steinmeyer uses all commonly known other designs for ball returns. However, the multiliner return represents the standard for all rolled ball screws. Steinmeyer also uses external return either as through-the-nut or end cap return. 2.4.1 | Multiliner (internal return) 2.4.3 | Through the nut return (external return) Multiliners lift the balls out of the It is also the ball return of choice for Steinmeyer‘s UltraSpeed return is where a similar piece guides the balls track...

2 | BALL SCREW TECHNOLOGY 2 | BALL SCREW TECHNOLOGY 2.5 | ROTATION SPEED VALUES Single nut with backlash Critical speed is the first (lowest) DN values allow easy comparison speed at which the ball screw shaft between different ball screw designs. screws with a single nut with clea- is in resonance. In applications with More sophisticated ball return sys- rance. This axial clearance amounts rotating shafts it limits the rpm of the tems result in higher DN values and, to approx. 0.01 mm with a maximum screw. Variables that influence it are conversely, lower DN values are as- 0.06 mm for the sizes...

2 | BALL SCREW TECHNOLOGY 2 | BALL SCREW TECHNOLOGY 2.7 | MAXIMUM LOADS The average axial load of a ball screw is normally around 10 % of the dynamic Values to avoid damage - Nuts with connecting thread load rating Ca. A load of exactly 10 % of Ca would lead to a calculated fatigue Connection thread Nut max. allowable axial force (kN) life of 109 revolutions. This is the upper limit of the scope of application of the Not all ball screw nuts can be loaded selected due to the desired fatigue life), this load has been reached. Here are up to the static load rating. For the static load rating is...

2 | BALL SCREW TECHNOLOGY 2 | BALL SCREW TECHNOLOGY 2.9.4 | Nut assembly Before the nut can be mounted on the shaft, the following points should be reviewed: Plastic wiper • Has the shaft been cleaned and aligned? Segment wipers are standard in a variety of applications: they reliably • heck desired nut orientation on the shaft (e.g. flange to the short journal C side?) prevent the penetration of shavings and coarse dirt particles but allow for • Align nut mounting tube on the shaft accordingly a certain amount of lubricant leakage. In conjunction with an automatic n Remove safety device oil...